Blue vat dyestuffs



Patented Sept. 1929 UNITED STATES PATENT OFFICE KARL THIESS, OF SINDLINGEN, NEAR HOCHST-ON-THE-MAIN, AND CARL, JOSE)? HELLER AND ERWIN HOFFA, OF EOCHST-ON-THE-MAIN, GERMANY, ASSIGNORS, BY MESNE ASSIGNMENTS, T GENERAL ANILINE WORKS, INC., OF NEW YORK,

N. Y., A COBI'OBATION OF DELAWARE BLUE VAT mmsrn'rrs Ho Drawing. Application filed January 4, 1924, Serial No. 684,452, and in Germany January 27, 1923.

It is known'that vat dyestufli's obtained by direct halogenation of vat-dyestuffs of the thioindig0-, indigoand indigoid series have still more or less similarity with dyestufi's free of halogen as regardstheir tints; thus e. g. the halo enated indigo dyestuffs give much clearer s ades than indigo itself but all still dye blue shades, and halogen derivatives obtained from thioindigo all still dye carminred to bluish-red tintsthe halogenated indigoid vat-dyestuffs, derived for instance from a-isatinchloride and m-naphthol, all more or less clear blue tints.

Now we have made the striking observation which is of great importance for the technic of dyeing viz, that the 2.3-2 .3 bis-naphththion'aphthenindigo giving grey-black tints with a green hue (produced according to German Patent 240,118, dated June 29, 1910,

l to Kalle & Co. A. G. Biebrich-on-Rhine, the

'40 wherein X stands for hydrogen, halogen or an alkyl group, at least one X being a halogen. The following examples illustrate our in vention:

1. 40 parts by 'l indigo (2.3-23' weight of 2.3-naphththio ample may be represented by bis naphththionaphthenindigo) are suspended in 400 parts of dry nitrobenzene and mixed with 40 parts of bromine. This mixture is stirred for about one hour at ordinary temperature and then slowly heated until it boils gently. At about 120 C. evolution of hydrogen bromide sets in which is complete after 2-3 hours. After cooling, the reaction product is filtered ofi' and freed from the adhering nitrobenzene by one of the usual methods.

The dyestufi' obtained according to this exthe following structural formula:

cox c/oo s/ S Br r The dyestuff thus obtained forms a reddish-blue powder which difiicultly dissolves in sulphuric acid with an olive-green colour and dyes cotton very fast indigo-blue tints. It contains 28-29% of bromine which corresponds to the introduction of 2 atoms of bromlne.

2. 40 parts of 2.3-naphththioindigo are introduced while stirring and cooling into 800 parts of sulphuric acid (66 B.). V After some time parts of bromine are slowly runinto this mixture and stirring is continued, at first while cooling and after 23 hours at ordinary temperature, until the dyestufl no longer takes up any bromine. The product thus obtained is poured on a mixture of ice and bisulfite, filtered and washed until it becomes neutral. The resulting dyestulf is substantially identical with that described in Example 1 and may be represented by the same structural formula.

3. parts of 2.3-naphththioindigo are suspended in 400 .parts of 'dry nitrobenzene. Afterhaving added a small quantity of iodine a strong current of dry chlorine is passed through this suspension while. heating on the of hydrochloric acid ceases.

water-bath until a test-sample shows an amount of chlorine of 15,3% (corresponding oo\C J00 s s 4. 40 parts of 2.3-naphththioindigo are triturated with 600 parts of dry chlorobenzene, then diluted with 400 parts of chlorobenzene and there are then added drop by dro at 40 C. 20 parts of sulphurylchloride. This temperature is now kept at 7080 for two hours and then at 120-130 until the evolution The isolated dyestuif is substantially a monochloro-derivative of the 2.3-naphththioindigo and dyes cotton very fast well covering blue tints which Have a more greenish hue than those of the dihalogen products. Analysis of the product proves that it contains 89% chlorine, from which may be concluded that it is a monochloro-derivative.

The dyestufi obtained according to this example may be represented by the following structural formula:

tam

.ing 16,2% of bromine, of the 2.3-naphththioindigo which dyes cotton dark blue intense tints.

\ The dyestufi obtained according to this example may be represented by the following structural formu a:

ame

6. Into a solution of 20 parts of bromine in 800 parts of chlorosulfonic acid are introduced while well cooling, 40 parts of 2.3-2.3'- naphththioindigo. After 2-3 hours a further quantity of 20 parts of bromine are run into the mixture whereu on it is stirred for some further time, poure on ice and filtered. The

dyestufi obtained contains 4 atoms of bromine (44.5% and dyes cotton pure blue tints.

The yestufi' obtained according to this example may be represented by the following structural formula:

r Br 7. 43 parts of the monochloro-2.3-naphththioindigo obtained according to example 4 are suspended in 400 parts of nitrobenzene and after the addition of 18 parts of bromine gradually heated to about 140 0., until the evolution of hydrogen bromide ceases. The

P isolated 'dyestufl' contains besides an atom of chlorine 1' atom of bromine and dyes cotton well-covering blue tints. The analysis shows an amount of bromine of 15,5% and an amount of chlorine of 7%.

The dyestufi' obtained according to this example may be represented by the following structural formula: 1

I coxhgoo The halogenation may also be carried out by any of the known methods for instance in concentrated sulphuric acid. Instead'of the halogens there may, as usual, be used halogen introducing a ents such, for instance, as sulphuryl chloride.

The properties of the dyestufi's obtained according to the above examples arein general similar.- They are violet-blue to blue powders, which dye fibers blue in hydrosulfite vats. In most organic solvents they are but slightly soluble even upon heating. They dissolve with characteristic colors in concentrated sulfuric acid.

Having now described our invention what we claim is:

1. As new products the halogenated bodies of the general formula:

wherein X stands for chlorine or hydrogen.

2. As new products the halogenated bodies of the general formula:

wherein X stands for hydrogen or halogen.

3. As a new product the va't dyesiufi of this following formula:

In testimony whereofywe afik our signaturesr KARL THIESS. CARL JOSEF MULLER. ERWIN HOFFA. 

